Bug 1771891 (CVE-2019-18849)

Summary:	CVE-2019-18849 tnef: security bypass in .ssh/authorized_keys file via an e-mail message
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dtimms
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-13 12:51:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1771892, 1771893
Bug Blocks:

Description Dhananjay Arunesh 2019-11-13 08:20:06 UTC

In tnef before 1.4.18, an attacker may be able to write to the victim's
.ssh/authorized_keys file via an e-mail message with a crafted winmail.dat
application/ms-tnef attachment, because of a heap-based buffer over-read
involving strdup.

Reference:
https://github.com/verdammelt/tnef/pull/40
https://github.com/verdammelt/tnef/compare/1.4.17...1.4.18

Comment 1 Dhananjay Arunesh 2019-11-13 08:21:10 UTC

Created tnef tracking bugs for this issue:

Affects: fedora-all [bug 1771892]

Comment 2 Dhananjay Arunesh 2019-11-13 08:21:48 UTC

Created tnef tracking bugs for this issue:

Affects: epel-all [bug 1771893]

Comment 3 Product Security DevOps Team 2019-11-13 12:51:30 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.